US20030109882A1 - Implant for bone connector - Google Patents
Implant for bone connector Download PDFInfo
- Publication number
- US20030109882A1 US20030109882A1 US10/207,911 US20791102A US2003109882A1 US 20030109882 A1 US20030109882 A1 US 20030109882A1 US 20791102 A US20791102 A US 20791102A US 2003109882 A1 US2003109882 A1 US 2003109882A1
- Authority
- US
- United States
- Prior art keywords
- implant
- clamp
- vertebral arch
- movable clamp
- fixing clamp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary pins, nails or other devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7047—Clamps comprising opposed elements which grasp one vertebra between them
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
- A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7056—Hooks with specially-designed bone-contacting part
Abstract
An implant for bone connector includes a fixing clamp, an implant body, a connecting portion and a movable clamp. The fixing clamp has a curved shape and supports a vertebral arch of a vertebra by grasping the vertebral arch. The implant body is provided on an upper portion of the fixing clamp. The connecting portion with which the connecting member is engaged is provided with the implant body. The movable clamp, which has a curved shape and grasps the vertebral arch, is provided to the implant body and is disposed to be opposed to the fixing clamp.
Description
- This application claims benefit of priority under 35 U.S.C. §119 to Japanese Patent Application No.2001-233986, filed on Aug. 1, 2001, the entire contents of which are incorporated by reference herein.
- 1. Field of the Invention
- The present invention relates to an implant for bone connector used for connecting bones, and more particularly, to an implant for bone connector having a connecting portion with which various connecting members are engaged.
- 2. Description of the Related Art
- When connecting bones such as thoracic vertebrae or lumbar vertebrae, the following method has been conventionally employed. A
first implant 3 is screwed intocentrum 1 such as the thoracic vertebra and the lumbar vertebra. Asecond implant 4 is screwed intocentrum 2. A connectingrod 5 connects thefirst implant 3 to thesecond implant 4 as shown in FIG. 1. - The
first implant 3 includes a screw portion and a head portion. The screw portion is screwed into centrum and the head portion with a large diameter has a rod engaging groove. Also, thesecond implant 4 includes the same conformation. Since end portions of the connectingrod 5 are fixed to the rod engaging groove of thefirst implant 3 and that of thesecond implant 4 respectively, the connectingrod 5 is integrally fixed to thefirst implant 3 and thesecond implant 4 and accordingly a bone connector is formed. - Further, an
implant 9 is screwed intocentrum 10 separating from thecentrum 1 and thecentrum 2 for hooking one end of a connectingmember 7 such as an artificial ligament. Ahook portion 9F is provided on an upper portion of theimplant 9, and one end portion of the connectingmember 7 is hooked over thehook portion 9F. Another end portion of the connectingmember 7 is hooked over ahook portion 5F provided on one top end (the side engaged the first implant 3) of theconnection rod 5. - Also, instead of using the connecting
rod 5, the connectingmember 7 may be used for connecting a first implant to a second implant. A first implant having a hook portion is screwed into thecentrum 1, a second implant having a hook portion is screwed into thecentrum 2, and both end portions of the connectingmember 7 are hooked over the hook portion of the first implant and that of the second implant respectively. - According to the above-described method screwing the implant for bone connector into the centrum for fixing a positional relation between vertebrae, it is necessary to precisely screw the implant into the centrum without damaging other portion. This method requires high technique and a burden of the centrum becomes large, because the implant is screwed into centrum.
- The present invention has been proposed in view of the above-described circumstances, and it is an object of the present invention to provide an implant for bone connector capable of being stably fixed to a vertebral arch of a vertebra without damaging the centrum and to various connecting members.
- In order to achieve the above object, the present invention provides an implant for bone connector comprising: a fixing clamp to support a vertebral arch of a vertebra by grasping the vertebral arch; an implant body provided on an upper portion of the fixing clamp; a connecting portion provided to an upper portion of the implant body for engaging a connecting member which connects the implant with another implant; and a movable clamp provided to the implant body and disposed to be opposed to the fixing clamp for grasping the vertebral arch.
- According to the present invention, the fixing clamp is provided to a lower portion of the implant body, and supports the vertebral arch of the vertebra by grasping the vertebral arch. The connecting portion is provided on the upper portion of the implant body, and the connecting member is engaged with the connecting portion. The movable clamp is provided to the implant body, is disposed to be opposed to the fixing clamp, and grasps the vertebral arch. Therefore, the implant can grasp the vertebral arch from both sides of the vertebral arch by means of the fixing clamp and the movable clamp, and is engaged with the connecting member. As a result, it is possible to stably fix the implant to the vertebral arch without damaging the centrum, and the implant can be used in the same manner as the conventional implant.
- In a preferred embodiment of the present invention, the fixing clamp has a curved shape.
- According to the embodiment, even if the fixing clamp has a curved shape, the fixing clamp can be engaged with the vertebral arch. Therefore, it is possible to stable fix the implant to the vertebral arch without damaging the centrum.
- In a preferred embodiment of the present invention, the movable clamp can be moved and adjusted in a direction approaching the fixing clamp and separating from the fixing clamp.
- According to the embodiment, since the movable clamp can be moved freely in accordance with a size of the vertebral arch, the implant can strongly grasp the vertebral arch from both sides of the vertebral arch by means of the fixing clamp and the movable clamp, and be stably fixed to the vertebral arch.
- In a preferred embodiment of the present invention, the movable clamp has a curved shape.
- According to the embodiment, even if the movable clamp has a curved shape, the movable clamp can be engaged with the vertebral arch. Therefore, it is possible to stably fix the implant to the vertebral arch without damaging the centrum.
- In a preferred embodiment of the present invention, the connecting portion has a rod engaging groove, with a female thread portion, through which the connecting member passes, and has an engaging groove, with a female thread portion, through which the movable clamp passes.
- According to the embodiment, it is possible to fix the connecting member and the movable clamp to the connecting portion by means of detent screws.
- FIG. 1 is a schematic diagram of a conventional implant for bone connector;
- FIGS. 2A and 2B are diagrams of an implant for bone connector according to a first embodiment of the present invention;
- FIGS. 3A and 3B are diagrams of an implant for bone connector according to a second embodiment of the present invention;
- FIG. 4 is a diagram of an implant for bone connector according to a third embodiment of the present invention;
- FIG. 5 is a perspective diagram of the implant for bone connector according to the third embodiment of the present invention;
- FIG. 6 is an exploded perspective diagram of the implant for bone connector according to the third embodiment of the present invention; and
- FIG. 7 is a diagram showing one using example of the present invention.
- Three embodiments of an implant for bone connector according to the present invention will be explained in detail based on the drawings. Constituent elements having the same functions as those of the above-described conventional configuration are designated with the same symbols, and redundant explanation is omitted.
- FIGS. 2A and 2B show a first embodiment of the present invention. As shown in FIG. 2A, an
implant 11 includes a block-like implant body 13, an U-shapedcurved fixing clamp 15, and amovable clamp 17. Theimplant body 13 has a circular or rectangular cross section and has a connecting portion which is engaged with a connecting member such as connectingrod 5. Thefixing clamp 15 is integrally provided to a lower portion of theimplant body 13 for supporting avertebral arch 3A of a vertebra by grasping thevertebral arch 3A. Themovable clamp 17 is provided to a lower portion of theimplant body 13 for grasping thevertebral arch 3A of the vertebra, and is disposed to be opposed to thefixing clamp 15. - More specific configuration of the lower portion of the implant body is as follows. The
movable clamp 17 includes a movable rod-like clamp body 17B and acurved hook potion 17F. As shown FIG. 2B, themovable clamp body 17B is fixed into anengaging groove 19 formed within theimplant body 13 by means of adetent screw 25. Thehook portion 17F is provided to be opposed to the fixingclamp 15 on a tip end of theclamp body 17B. Thehook portion 17F grasps thevertebral arch 3A. - A position of the
movable clamp 17 is adjusted in a direction approaching the fixingclamp 15 and separating from that for grasping thevertebral arch 3A. Also, it is possible to rotate and adjust themovable clamp 17 around an axis of the rod-like clamp body 17B. In order to fix themovable clamp 17 in the position fitting to a size of thevertebral arch 3A, afemale thread portion 23 is formed on a surface of the engaginggroove 19. Therefore, themovable clamp 17 is fixed in a proper position by screwing thedetent screw 25 into thefemale thread portion 23. As a result, it is possible to adjust themovable clamp 17 to the desired position. - A
rod engaging groove 27 to be fixed to theconnection rod 5 is formed at an upper portion of the engaginggroove 19. A width of therod engaging groove 27 is slightly greater than that of the engaginggroove 19. Afemale thread portion 29 is formed on a surface of therod engaging groove 27. Adetent screw 31 for fixing theconnection rod 5 to theimplant body 13 is screwed into thefemale thread portion 29. - With the above configuration, the fixing
clamp 15 supports thevertebral arch 3A by grasping thevertebral arch 3A, and thehook portion 17F of themovable clamp 17 grasps thevertebral arch 3A. Therefore, theimplant 11 can grasp thevertebral arch 3A from both sides of thevertebral arch 3A by means of the fixingclamp 15 and themovable clamp 17. Thereby it is possible to stably fiximplant 11 to thevertebral arch 3A without damaging the centrum. At that time, it is easy to fix theimplant 11 to thevertebral arch 3A, because thedetent screw 25 can be rotated and operated without interruption of vertebra and another implant by means of a tool for screwing thedetent screw 25 into thefemale thread portion 23 from the upper direction of thefemale thread portion 23. - As described above, after the
implant 11 is fixed to thevertebral arch 3A in this manner, theconnection rod 5 is fixed to therod engaging groove 27 by screwing thedetent screw 31 into thefemale thread portion 29, thereby theconnection rod 5 is fixed to theimplant 11. - In the above-explained embodiment, the
movable clamp 17 and theconnection rod 5 are fixed to theimplant body 13, and the engaginggroove 19 and therod engaging groove 27 are formed in theimplant body 13 such as to open upward. Alternatively, holes through which themovable clamp 17 and theconnection rod 5 pass may be formed horizontally, and accordingly female thread portions into which the detent screws 25 and 31 are screwed may be formed to each upper potion of the former hole. - It is also possible to form a male thread in an outer peripheral surface of the
implant body 13, and to screw a nut member into the male thread for fixing themovable clamp 17 and the connectingrod 5 to implantbody 13. At that time, using theclamp body 17B of themovable clamp 17, it is also possible to provide a long hole in theclamp body 17B through which theimplant body 13 can pass such as to sandwich theimplant body 13, and it is also possible to make theclamp body 17B as a bifurcated configuration. - FIGS. 3A and 3B show a second embodiment of the present invention. In this embodiment, an annular recess13C is formed on a connecting portion with which a connecting
member 7 is engaged, and the connectingmember 7 such as artificial ligament, wire or cable instead of theconnection rod 5 may be used. Other configuration is the same as that of the previous embodiment, constituent elements having the same functions are designated with the same symbols, and redundant explanation is omitted. - FIGS.4 to 6 show a third embodiment of the present invention. In an
implant 11 of this embodiment, amovable clamp 33, which is disposed to be opposed to the fixingclamp 15 and which grasps thevertebral arch 3A, is provided on an upper portion of theimplant body 35. Themovable clamp 33 can be freely slid and turned or fixed. - More specifically, as shown in FIG. 6, a
thread hole 35H is formed on an upper surface of theimplant body 35 having the fixingclamp 15, and athread portion 37S which is screwed into thethread hole 35H is provided on a lower portion of thehook portion 37. Themovable clamp 33 includes acurved hook portion 33F on a tip end of aclamp body 33B. Theclamp body 33B of themovable clamp 33 has a slit or along hole 33H. Since themovable clamp 33 is disposed to be opposed to the fixingclamp 15, thehook portion 33F grasps thevertebral arch 3A of the vertebral arch at the opposite side of the fixingclamp 15. - In the above configuration, as shown in FIG. 6, the
clamp body 33B of themovable clamp 33 is disposed between theimplant body 35 and thehook portion 37 and then, thethread portion 37S of thehook portion 37 is allowed to pass through thelong hole 33H formed in theclamp body 33B and to be screwed into thethread hole 35H of theimplant body 35. Then, themovable clamp 33 is sandwiched between theimplant body 35 and thehook portion 37. - In a state in which the
movable clamp 33 is softly sandwiched between theimplant body 35 and thehook portion 37, themovable clamp 33 can be moved and adjusted in a direction approaching the fixingclamp 15 and separating from that, and themovable clamp 33 can be rotated and adjusted around thethread portion 37S of thehook portion 37. Therefore, themovable clamp 33 can be adjusted to a size of thevertebral arch 3A. If thethread portion 37S of thehook portion 37 is strongly fastened to thethread hole 35H, theclamp body 33B of themovable clamp 33 is strongly sandwiched and fixed between theimplant body 35 and alower flange 37F provided on a lower portion of thehook portion 37. Therefore, theimplant 11 can firmly grasp thevertebral arch 3A from both sides of thevertebral arch 3A by means of the fixingclamp 15 and themovable clamp 33. That is, in this embodiment, thehook portion 37 serves as a hook over which the connectingmember 17 is hooked, and as a fixing tool for fixing themovable clamp 33. - Since the
implant 11 firmly grasps thevertebral arch 3A from both of sides of thevertebral arch 3A by means of the fixingclamp 15 and themovable clamp 33, theimplant 11 can be fixed to the centrum. Therefore, the same effect as theimplant 11 of the first and the second embodiments can be obtained, and theimplant 11 can be fixed to the centrum more stably. - FIG. 7 shows one example in which the connecting
member 7 is hooked over theimplant 11 and theimplant 9. In this case, theimplant 9 which is screwed into centrum is used instead of theimplant 11. - The above-described embodiment is one example of the present invention. Thus, the present invention is not limited to the above embodiment, and various modifications can be made in accordance with configuration within a range not departing from technical idea of the invention.
- That is, although both the fixing clamp and moving clamp have curved shapes respectively in the three embodiments, the present invention is not limited to this, and the invention can be applied only if the
vertebral arch 3A of the vertebra can be grasped.
Claims (5)
1. An implant for bone connector comprising:
a fixing clamp to support a vertebral arch of a vertebra by grasping the vertebral arch;
an implant body provided on an upper portion of the fixing clamp;
a connecting portion provided to an upper portion of the implant body for engaging a connecting member which connects the implant with another implant; and
a movable clamp provided to the implant body and disposed to be opposed to the fixing clamp for grasping the vertebral arch.
2. An implant for bone connector according to claim 1 , wherein the fixing clamp has a curved shape.
3. An implant for bone connector according to claim 1 , wherein the movable clamp can be moved and adjusted in a direction approaching the fixing clamp and separating from the fixing clamp.
4. An implant for bone connector according to claim 3 , wherein the movable clamp has a curved shape.
5. An implant for bone connector according to claim 1 , wherein the connecting portion has a rod engaging groove, with a female thread portion, through which the connecting member passes, and has an engaging groove, with a female thread portion, through which the movable clamp passes.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001233986A JP2003038507A (en) | 2001-08-01 | 2001-08-01 | Implant for bone joining implement |
JP2001-233986 | 2001-08-01 | ||
JPJP2001-233986 | 2001-08-01 |
Publications (2)
Publication Number | Publication Date |
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US20030109882A1 true US20030109882A1 (en) | 2003-06-12 |
US6802845B2 US6802845B2 (en) | 2004-10-12 |
Family
ID=19065679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/207,911 Expired - Fee Related US6802845B2 (en) | 2001-08-01 | 2002-07-31 | Implant for bone connector |
Country Status (5)
Country | Link |
---|---|
US (1) | US6802845B2 (en) |
EP (1) | EP1281363B1 (en) |
JP (1) | JP2003038507A (en) |
KR (1) | KR100537768B1 (en) |
DE (1) | DE60232844D1 (en) |
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-
2002
- 2002-07-31 EP EP02016931A patent/EP1281363B1/en not_active Expired - Fee Related
- 2002-07-31 US US10/207,911 patent/US6802845B2/en not_active Expired - Fee Related
- 2002-07-31 DE DE60232844T patent/DE60232844D1/en not_active Expired - Fee Related
- 2002-07-31 KR KR10-2002-0045337A patent/KR100537768B1/en not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
US6802845B2 (en) | 2004-10-12 |
EP1281363B1 (en) | 2009-07-08 |
EP1281363A3 (en) | 2004-01-07 |
KR20030013284A (en) | 2003-02-14 |
JP2003038507A (en) | 2003-02-12 |
EP1281363A2 (en) | 2003-02-05 |
KR100537768B1 (en) | 2005-12-19 |
DE60232844D1 (en) | 2009-08-20 |
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